Well, how is your skill set? Reason I ask is the 18" E can be built somewhat easily without having to resort to A LOT of aftermarket bits. If your paint and build skills are up to snuff, then I can see adding some aftermarket bits to it. But, if you are just starting out, I would be more in favor of focusing on construction as opposed to trying to cram a lot of parts onto it as basic construction and paintwork will go a long way towards making the ship look good regardless of what resin is on it (although a bridge dome and deflector dish will make the most improvements for the least amount of money IMHO).
I've put together one Youtube video that showcases some of the basic building techniques and tricks I've come up with for 18" Enterprises over the years. I've also got a set of videos documenting my build of a studio scale replica of the USS Constellation using an old 18" long box kit as well. Check it out:
18" Starship Enterprise Building tips and techniques - YouTube
As for kit, decal and window set, if you get any of the Round 2 AMT reissues (either the AMT 610 boxing with the reproduction long box artwork or the Tholian Web edition, or the tin versions) you get a very accurate decal sheet which HAS windows on it to do the model with lighted or unlit windows. R2 pretty much just blew up the artwork from their 1/1000 Polar Lights kit to do it, but they added names and NCC numbers for the other starships. Here's my review of the kit over at CultTVman.com
http://culttvman.com/main/?p=1023
Buy one of these and you can literally kill three birds with one stone.
